Epidemic Spreading in Scale-Free Networks-英文文献.pdf

Epidemic spreading in scalefree networks Romualdo PastorSatorras 1 and Alessandro Vespignani 2 1 Dept de Fsic a i Enginyeria Nuclear Universitat Politecnic a de Catalunya Campus Nord Bloc BB Barcelona Spain 2 The Abdus Salam International Centre for Theoretical Physics ICTP PO Box 0 0 Trieste Italy 0 2 Octob er t c O 0 2 Abstract 7 1 The Internet as well as many other networks has a very complex connectiv 3 0 1 ity recently mo deled by the class of scalefree networks This feature whic h 0 0 app ears to b e very ecient for a communications network favors at the same / t a time the spreading of computer viruses We analyze real data from computer m d- virus infections and nd the average lifetime and prevalence of viral strains on n o the Internet We dene a dynamical mo del for the spreading of infections on c : v scalefree networks nding the absence of an epidemic threshold and its asso i X ciated critical b ehavior This new epidemiological framework rationalize data r a of computer viruses and could help in the understanding of other spreading phenomena on communication and so cial networks PACS numb ers Ln q Typ eset using REVT X E Many so cial biological and communication systems can b e prop erly describ ed by com plex networks whose no des represent individuals or organizations and links mimic the in teractions among them Particularly in